You guru's may get tired of my questions about the same building project, but here it goes.
I'm wiring a cinder block building with concrete floors for a residence so we're talking a lot of conduit and THHN which I've never used before.
For starters, is there a free resource for finding the conduit dimensions I'm going to need for running all this THHN through rigid conduit?
Also, above 8 feet high, and in the ceilings, or above exposed ceiling rafters, do I still need to have THHN in conduit or can I just wire tie them together?
Also, any suggestions on the cheapest way to wire a structure like this that doesn't have many accessible walls.

Google conduit fill and you'll find the charts you need as to number of conductors, etc.

As for wire tying the conductors, NO. They have to be in conduit. You could POSSIBLY put in a junction box and change over to BX.

Can you use EMT? It's easier to work with and bend.

Hope that helps some.

I think I can use EMT. Can I use PVC and just pull a ground? If so, what kind of PVC is suitable for exposed work?

Thanks, medic-dan, for the correct key words.
For any one else looking, here is a link for metal conduit:
Conduit Fill Chart
And for PVC:
PVC Conduit Fill Table

You're welcome.

If you're using EMT or PVC you're pulling a ground. You could check with your local building inspector when you pull the permit. EMT is actually pretty easy to work with. It doesn't take very long to learn how to figure out bending it.

Some jurisdictions may require a specific type of conduit for a given situation.